[The 100 largest cities in the world].

In order to facilitate international comparisons, since national definitions of cities vary considerably, the author presents the concept of the continuity of built-up areas. Using the proposed definition, the 100 most-populated cities are listed. The author notes that the four largest, in descending order of population size, are Tokyo, the New-York-Philadelphia conurbation, Sao Paulo, and Mexico City. The rapid increase in the population of very large cities since 1950 is noted. (SUMMARY IN ENG AND SPA)